UseSeed and UseDateTimeReference implemented

src/Abstract/IAutoFaker.cs

@@ -46,4 +46,19 @@ public interface IAutoFaker
 
 
     void Configure(Action<IAutoFakerDefaultConfigBuilder> configure);
+
+    /// <summary>
+    /// Creates a seed locally scoped within the <seealso cref="Faker{T}"/> ignoring the globally scoped <seealso cref="Randomizer.Seed"/>.
+    /// If this method is never called the global <seealso cref="Randomizer.Seed"/> is used.
+    /// </summary>
+    /// <param name="seed">The seed value to use within the <seealso cref="Faker{T}"/> instance.</param>
+    void UseSeed(int seed);
+
+    /// <summary>
+    /// Sets a local time reference for all DateTime calculations used by
+    /// the <seealso cref="Faker{T}"/> instance; unless refDate parameters are specified 
+    /// with the corresponding Date.Methods().
+    /// </summary>
+    /// <param name="refDate">The anchored DateTime reference to use.</param>
+    void UseDateTimeReference(DateTime? refDate);
 }

src/AutoFaker.cs

@@ -125,4 +125,14 @@ public static List<TType> GenerateStatic<TType>(int count, Action<IAutoGenerateC
         var faker = new AutoFaker(configure);
         return faker.Generate<TType>(count);
     }
+
+    public void UseSeed(int seed)
+    {
+        Faker.Random = new Randomizer(seed);
+    }
+
+    public void UseDateTimeReference(DateTime? refDate)
+    {
+        Faker.DateTimeReference = refDate;
+    }
 }

src/Extensions/AutoGenerateContextExtension.cs

@@ -79,7 +79,7 @@ internal static List<TType> GenerateMany<TType>(AutoFakerContext context, int co
         {
             var items = new List<TType>(count);
 
-            for (int i = 0; i < count; i++)
+            for (var i = 0; i < count; i++)
             {
                 TType? item = generate.Invoke();
 
@@ -92,7 +92,7 @@ internal static List<TType> GenerateMany<TType>(AutoFakerContext context, int co
         else
         {
             var hashSet = new HashSet<TType>();
-            int attempts = 0;
+            var attempts = 0;
             int totalAttempts = count + maxAttempts - 1;
 
             while (hashSet.Count < count && attempts < totalAttempts)

test/Soenneker.Utils.AutoBogus.Tests/AutoFakerTests.cs

@@ -339,7 +339,7 @@ public void Generate_ImmutableList_should_generate()
         immutableListDto.List.Should().NotBeNullOrEmpty();
         immutableListDto.IList.Should().NotBeNullOrEmpty();
     }
-    
+
     [Fact]
     public void Generate_ImmutableArray_should_generate()
     {
@@ -420,6 +420,20 @@ public void TestClassWithPrivateProperty_should_be_null()
         obj.GetValue().Should().BeNull();
     }
 
+    [Fact]
+    public void UseSeed_should_generate_same_value()
+    {
+        var faker1 = new AutoFaker();
+        faker1.UseSeed(1);
+        var value1 = faker1.Generate<int>();
+
+        var faker2 = new AutoFaker();
+        faker2.UseSeed(1);
+        var value2 = faker2.Generate<int>();
+
+        value1.Should().Be(value2);
+    }
+
     [Fact]
     public void Generate_with_recursive_depth_0_should_generate()
     {